Senate Republicans are asking President Barack Obama to withdraw Donald Berwick as his nominee to serve as administrator of the Centers for Medicare and Medicaid Services.

In a letter organized by Republican Sens. Orrin Hatch (Utah) and Mike Enzi (Wyo.) — the ranking members, respectively, on the Finance Committee and the Health, Education, Labor and Pensions Committee — 42 GOP Senators argue for replacing Berwick with a nominee who has the “confidence” of the American people.

“Once you have withdrawn his nomination, we are confident we can all work together to find a nominee for Administrator we can support and confirm after appropriate hearings are held,” reads the letter, which was joined by all members of Senate Republican leadership.

Republicans have been opposed to Berwick’s nomination from the beginning because of opinions that he has expressed in support of socialized medicine. Obama installed him as administrator of CMS last year using a recess appointment.